<template>
  <div>
    <div class="todo-header">
      <input
        type="text"
        placeholder="请输入你的任务名称，按回车键确认"
        @keyup.enter="add"
        v-model="title"
      />
    </div>
  </div>
</template>

<script>
// nanoid类似于uuid，会生成一串唯一的字符串
import { nanoid } from "nanoid";

export default {
  name: "MyHeader",
  props: ["addTodo"],
  data() {
    return {
      title: "",
    };
  },
  methods: {
    add(e) {
      //判断输入
      if (this.title.trim() == "") return alert("输入不可以为空");

      // console.log(e.target.value);
      // 将用户的输入包装成一个todo对象
      const todoObj = { id: nanoid(), title: e.target.value, done: false };
      // console.log(todoObj);
      this.addTodo(todoObj);

      //清空行内数据
      this.title = "";
    },
  },
};
</script>

<style>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>